Novel adhesives and tapes including same

ABSTRACT

Novel adhesives for preparing metal foil adhesive tapes meeting Underwriter Laboratories requirements for use with rigid fiberglass air ducts, which adhesives comprise a self- (internally) crosslinked copolymer of: (1) from about 1.5 to about 2.5 parts by weight of at least one activated ester-containing vinyl monomer of Formula I (as defined hereinafter); (2) from about 11 to about 14 parts by weight of at least one ethylenically unsaturated carboxylic acid containing 3-5 carbon atoms; (3) from about 70 to about 80 parts by weight of at least one acrylic or methacrylic acid ester of a non-tertiary alcohol having 1-14 carbon atoms; and (4) from about 6 to about 15 parts by weight of at least one vinyl ester of a saturated carboxylic acid.

RELATED APPLICATIONS

This application is related to my copending applications, Ser. Nos.019,832 filed Feb. 28, 1987 and 030,765 filed Mar. 25, 1987.

BACKGROUND OF THE INVENTION

The present invention relates to novel adhesives and, more particularly,to novel adhesives which can be coated onto an aluminum backing materialto provide so-called foil tapes which meet the very severe UnderwriterLaboratories, Inc. (UL) 181A requirements and specifications for usewith rigid fiberglass air ducts.

Foil tapes, e.g. pressure-sensitive or heat-bonded aluminum tapes are ofcourse known in the art. It is also heretofore known to employ foiltapes for such purposes as closure systems for use with factory-made airducts and connectors. However, recently UL has imposed very severestandards for this usage. Consequently, the primary task of thisinvention can be said to develop a novel aluminum (foil) tape which willmeet the recent UL requirements and specifications, as detailedhereinafter, for the aforementioned usage.

UL Test No. 1: Peel Adhesion

Three samples from each of three separate rolls of tape cut in one inch(25.4 mm) wide by 12 inches (305 mm) long strips are to be tested. Thetape samples are to be applied (as specified in ASTM D-333-83) to astainless steel panel with a mechanically operated roller weighing 10pounds (4.53 kg). The roller is to pass over each sample five times ineach direction. The test load is to be applied 15 minutes aftercompletion of the rolling. The average peel adhesion strength of eachroll of aluminum tape shall be ≧3.75 lbs. (60 oz.) per inch of width(0.66N/mm) of tape, with no individual sample having a value ≦3.20 lbs.(51.2 oz.) per inch of width (0.56N/mm).

UL Tests Nos. 2-5: Shear Adhesion

The shear adhesion strength of aluminum tape is to be determined inaccordance with ASTM D-3654-82, as modified in the followingdescription. One sample from each of four separate rolls are to betested. Samples are to be cut in 1-inch (25.4 mm) wide by 6-inch (152mm) long strips. The cut samples and specified stainless steel panelsare to be maintained at the specified application conditions a minimumof one hour prior to applying samples to the panels. The tape is to beapplied to the panel with a mechanically operated roller weighing 10pounds-mass (4.53 kg). The roller is to pass each sample five times ineach direction. Using a cutting gig or razor blade, the rolled portionof the sample is to be trimmed to a 1 inch by 1 inch square on thepanel, such that the remaining test sample measures 1 inch by 5 inches.The tape is to be allowed to dwell on the panel for the specified time.After dwelling, the clamp is to be placed on the free end of the sample,insuring that the clamp extends completely across the width of thespecimen and is aligned to uniformly distribute the load. The specifiedtest load is then to be applied to the clamp gently so as not to causeany shear impact force on the sample. The load is to be applied for thespecified test duration. The test panel is to be positioned at 2 degreesfrom the vertical so that the test substrate forms a 178° angle with theextended tape sample. Individual samples of the tape are to be tested inaccordance with each of the conditions as set forth hereinbelow:

    ______________________________________                                        Application   Dwell   Test     Test                                           Condition     Time    Condition                                                                              Load   Duration                                ______________________________________                                        2. 40° F. (4.4° C.)                                                           15 min. 40° F.                                                                           5 lbs.                                                                               6 hours                                dry substrate                  (22.2 N)                                       3. 73.4° F. (23° C.)                                                          15 min. 73.4° F.                                                                         5 lbs.                                                                               6 hours                                50% RH                                                                        4. 73.4° F. (23° C.)                                                          24 hrs. 73.4° F.                                                                        10 lbs.                                                                              120 hours                               50% RH                                                                        5. 73.4° F. (23° C.)                                                          15 min. 150° F.                                                                          5 lbs.                                                                               6 hours                                50% RH                (65.6° C.)                                       ______________________________________                                    

The shear adhesion strength of the tape (in each of the above tests)shall be such that the tape is able to maintain these test loadsspecified in the tests for the indicated test durations without evidenceof separation or slippage in excess of 1/32 inch (0.79 mm).

The aforementioned tests (peel adhesion and shear adhesion) constitutethe essential criteria which are critical to achieve in order to providean aluminum tape meeting UL specifications for use with air ducts andconnectors. However, for the sake of accuracy, it is to be noted thatthey are not the only tests which must be passed to satisfy ULspecifications. One such test is a tensile strength test for the tapebacking (foil). Another is peel adhesion at 20° angle. The former is notrelevant to this invention and the latter will be met if the adhesivepasses the five critical tests enumerated above.

Other UL criteria, specifically surface burning characteristics, moldgrowth and humidity test, temperature/pressure cycling tests, burningtest and manufacturing and production tests, as detailed in UL181A, arenot difficult to meet and for purpose of a clear understanding of thenature and objects of this invention need not be described.

My aforementioned copending application, Ser. No. 019,832 is alsodirected to the task of providing an adhesive which can be employed forpreparing metal foil adhesive tapes meeting UL specifications. In thiscopending application, the task is solved by providing an adhesivecomposition comprising a crosslinked copolymer of:

(1) at least one specified macromolecular monomer;

(2) at least one ethylenically unsaturated carboxylic acid containing3-5 carbon atoms;

(3) at least one acrylic or methacrylic acid ester of a non-tertiaryalcohol having 1-14 carbon atoms; and

(4) at least one vinyl ester of a saturated carboxylic acid;

the tetrapolymer being crosslinked with a crosslinking agent reactivewith said carboxylic acid moiety through its reactive hydrogen atom.

My aforementioned copending application, Ser. No. 030,765, to which thepresent invention is more closely related, also relates to adhesives forpreparing metal foil tapes meeting the aforementioned UL specifications,the task being solved by employing, in lieu of the macromolecularmonomers of Ser. No. 019,832, an activated ester-containing vinylmonomer of the formula: ##STR1## wherein R is hydrogen or methyl; andeach R', which may be the same or different, is alkyl having 1-6 carbonatoms, cycloalkyl having 5-6 carbon atoms, or a 2-hydroxyalkyl 2-6carbon atoms, the polymer being crosslinked with a crosslinking agentreactive with the carboxylic acid moiety through its reactive hydrogenatom.

Useful monomers of Formula I include methyl acrylamidoglycolate methylether (MAGME), ethyl acrylamidoglycolate ethyl ether, butylacrylamidoglycolate butyl ether, methyl acrylamidoglycolate ethyl ether,and ethyl acrylamidoglycolate methyl ether.

The monomers of Formula I, including the aforementioned illustrativespecies, are known in the art and are described, for example, in U.S.Pat. No. 4,521,563 issued to Howard R. Lucas and assigned to AmericanCyanamid Company.

A preferred monomer of this description is: ##STR2##Methylacrylamidoglycolate methyl ether

    (MAGME)

a white solid, melting point 70°-73° C., available commercially in95-97% purity from American Cyanamid Co. A preferred method of preparingMAGME is disclosed in U.S. Pat. No. 4,443,623,issued to James M. Photisand assigned to American Cyanamid Company.

As examples of useful ethylenically unsaturated carboxylic acidscontaining 3-5 carbon atoms, mentioned may be made of acrylic acid,methacrylic acid, titaconic acid, maleic acid and fumaric acid, acrylicacid being particularly preferred.

Useful acrylic or methacrylic acid esters of non-tertiary alcoholshaving 1-14 carbon atoms include those previously mentioned withreference to U.S. Pat. No. 4,554,324, i.e. methanol, ethanol, propanoland iso-propanol 1-butanol, 1-pentanol, 2-pentanol, 3-pentanol,2-methyl-1-butanol, 1-methyl-1-butanol, 1-methyl-1-pentanol,2-methyl-1-pentanol, 3-methyl-1-pentanol, 2-ethyl-1-butanol,3,5,5-trimethyl-1-hexanol, 3-heptanol,2-octanol,1-decanol, 1-dodecanolas well as others. Preferred are acrylic acid esters of non-tertiaryalcohols having 4-14 carbon atoms, e.g. butyl acrylate, amyl acrylate,decyl acrylate, lauryl acrylate, and the like, 2-ethylhexyl acrylatebeing particularly preferred.

Suitable vinyl esters are those wherein the acid contains 1-6 carbonatoms, e.g. vinyl acetate, vinyl proportionate, vinyl butyrate, vinylvalerte, etc., vinyl acetate being particularly preferred.

As is described, following polymerization of the recited monomericcomponents, a crosslinking agent reactive with the carboxylic acidmoiety is then added in a quantity sufficient to effect crosslinking ofthe polymer so as to increase the shear adhesion to meet ULrequirements. In like manner, the ranges of monomeric components willalso be selected to satisfy the UL requirements.

In the latter context, the following ranges of monomers were found to beoperative:

(1) from about 5 to about 20 parts by weight of a monomer or mixture ofmonomers of Formula I;

(2) from about 3 to about 10 parts by weight of ethylenicallyunsaturated carboxylic acid;

(3) from about 70 to about 85 parts by weight of acrylic or methacrylicacid ester of a non-tertiary alcohol having 1-14 carbon atoms; and

(4) from about 7 to about 22 parts by weight of vinyl ester of asaturated carboxylic acid.

The inventions described and claimed in both of these copendingapplications will provide adhesives suitable for preparing metal foiltapes meeting UL specifications for use with rigid fiberglass air ducts.However the macromers required in the former application are not readilycommercially available. On the other hand, the monomers of Formula I,e.g. MAGME, employed in the latter application are relatively expensive.

Accordingly, broadly speaking, the task of the present invention may besaid to be to provide a more cost-effective and thus a more commerciallycompetitive adhesive of this description, utilizing available materials.

More specifically, the task may be said to be to devise a systemutilizing the monomeric components of the latter application whereinappreciably less of the recited and relatively expensive monomer ofFormula I is employed.

BRIEF DESCRIPTION OF THE INVENTION

In accordance with the present invention, it has been discovered that ifthe monomeric components of the latter application are admixed in thefollowing proportions:

(1) from about 1.5 to about 2.5 parts by weight of the monomer ofFormula I;

(2) from about 11 to about 14 parts by weight of ethylenicallyunsaturated carboxylic acid containing 3-5 carbon atoms;

(3) from about 70 to about 80 parts by weight of acrylic and/ormethacrylic acid ester of a non-tertiary alcohol having 1-14 carbonatoms; and

(4) from about 6 to about 15 parts by weight of at least one vinyl esterof a saturated carboxylic acid,

in the presence of an acid catalyst, the requisite adhesive meeting ULspecifications is obtained without the need of an additionalcrosslinking agent.

The very substantial reduction in the amount of monomer of Formula Iemployed has been found to provide a cost reduction in manufacture of onthe order of about 30 percent.

DETAILED DESCRIPTION OF THE INVENTION

As previously stated, the present invention is directed to acost-effective procedure for preparing metal foil adhesive tapes meetingUL181A requirements for use with rigid fiberglass air ducts.

In essence, the present invention can be said to be an improvements overthe teachings of the aforementioned copending application, Ser. No.030,765 wherein appreciably less of the relatively expensive monomer ofFormula I is required to obtain an adhesive satisfying the ULspecifications.

These monomers may be described as being multifunctional acrylicmonomers in the sense that both the vinyl end group and the alkoxymethylamide group are reactive.

The preferred monomer of this formula is "MAGME" (trademark of Cyanamidfor methyl acrylamidoglycolate methyl ether) and the invention willaccordingly be described in detail by reference thereto.

MAGME is a reactive crosslinking monomer illustrative of Formula Icombining a readily polymeriable vinyl end group and a methoxymethylamide group which is responsive to acid catalysis.

Because of the reactivity of the double bond (vinyl group), MAGME can bepolymerized with most vinyl monomers, e.g. acrylates, methacrylates,styrene, acrylonitrile, acrylamide, vinyl acetate, etc.

On the other hand, polymers containing MAGME monomer can be heat curedusing acidic catalysts. The amide derivatives of MAGME also undergo thisreaction. Curing can occur either by self-condensation or by reactionwith hydroxyl, carboxyl or amide groups. Either reaction providesmethanol as a reaction by-product.

The self-condensation is as follows: ##STR3##

The reaction with carboxyl, for example, may proceed according to thefollowing two alternate reaction schemes or equations: ##STR4##

Because of its ability to function an an "internal" or "latent"crosslinker which can be self-condensed or crosslinked in the presenceof acid catalysts, no "external" or additional crosslinker is needed inthe practice of this invention.

The precise mechanism of the crosslinking reaction in the presence of anacid catalyst for a given formulation is not entirely clear. It may takeplace between the MAGME moieties of two polymer molecules by theself-condensation reaction of equation (1) by substitution of the RCOO--moiety of the ethylenically unsaturated carboxylic acid (e.g. acrylicacid) monomer for the methoxy substituent as illustrated in equation;(2) by substitution of the --COOR for the --CO₂ CH₃ as illustrated inequation; (3) or by a combination of the above reactions.

In any event, sufficient crosslinking will occur to pass UL181Aspecifications. In this context, it will be noted that if no acidcatalyst is employed, the resulting adhesive will not pass thesespecifications.

In general, if too little acid catalyst is employed, there will beinsufficient crosslinking to meet the UL specifications and the adhesivewill fail. On the other hand, if too much is used, the adhesive tends tolose tack. In any event, the amount of acid catalyst to be employed willbe readily apparent by routine experimentation to one skilled in the artin the light of the foregoing discussion. By way of illustration,however, from about 0.02 to about 0.06 parts by weight per 100 parts byweight of polymer has been found to be satisfactory.

The selection of the particular acid catalyst to be employed will alsobe within the expected judgment of the skilled worker. Acid catalystsare of course well known and understood in the art. In general, they maybe characterized as being strong acids. Sulfonic acids such as p-toluenesulfonic acid and methane sulfonic acid are illustrative of thosecommonly employed.

Apart from the need for an acid catalyst, the amounts of monomers whichmay be employed are critical within fairly narrow ranges in order toachieve consistent or reproducible acceptable results.

It has been found that the ranges of monomers which may be employed are:

(1) from about 1.5 to about 2.5 parts by weight of the monomer ofFormula I;

(2) from about 11 to about 14 parts by weight of the ethylenicallyunsaturated acid;

(3) from about 70 to about 80 parts by weight of the acrylic ormethacrylic acid ester; and

(4) from about 6 to about 15 parts by weight of the vinyl ester.

The novel adhesives of this invention may be prepared by initiatingpolymerization of the monomeric components in a suitable organic solventand then adding the acid catalyst to the reaction mixture shortly beforepolymerization is complete, e.g. after polymerization is about 3/4complete. The polymerization is then allowed to proceed to completion.

The selection of the organic solvent for the monomers is not criticaland useful solvents will be within the expected judgement of the skilledworker. By way of illustration a 1/99 mixture of isopropyl alcohol andethyl acetate was employed in the following illustrative examples.

In these examples, the following polymers were prepared:

                  TABLE 1                                                         ______________________________________                                                                               Solids                                 Cpd. EHA     MAG     AA    VA    Cat.  %     Visc.                            ______________________________________                                        1    76      2       11    11    0     48.4  12.3                             2    76      2       11    11    0.04  48.7  10.5                             3    75      2       12    11    0.04  48.9  10.2                             4    74      2       13    11    0.04  49.2  12.0                             5    73      2       14    11    0.04  48.8  20.0                             ______________________________________                                         EHA = 2ethylhexyl acryalate                                                   MAG = MAGME                                                                   AA = Acrylic acid                                                             VA = Vinyl acetate                                                            CAT. = Acid catalyst                                                     

EXAMPLE 1

Two monomer solutions were prepared with the following amounts in grams:

    ______________________________________                                                          (1)  (2)                                                    ______________________________________                                        2-Ethylhexyl Acrylate                                                                             9.50   28.50                                              MAGME               0.25   0.75                                               Acrylic Acid (glacial)                                                                            1.38   4.12                                               Vinyl Acetate       1.38   4.12                                               Luprisol PMS        0.125  --                                                 Isopropyl Alcohol   0.13   0.37                                               (reagent grade)                                                               Ethyl Acetate       16.27  22.03                                              (reagent grade)                                                               ______________________________________                                    

Monomer solution (1) was charged into a reactor, heated to 75°-77° C.and sparged with nitrogen. An exotherm was noted within 20 minutes. Atthe beginning of the exotherm, the upper jacket cooling was turned on tofull cooling to control the temperature to less than 85° C. Thetemperature was maintained at 77°-85° C. for 40 minutes after the peakof the exotherm. After this period an initiator solution of 0.115 gramsof azobisisobutyronitrile (AIBN) and 5.65 grams of ethyl acetate andmonomer solution (2) were fed into the reactor in separate streams. A(second) exotherm was noted within 20-30 minutes. After this exothermsubsided, a temperature of 77°-81° C. and a blanket of nitrogen weremaintained over the polymer reaction mixture. The lines were then rinsedwith 4.0 grams of ethyl acetate, after which the reaction mixture wasmaintained at about 77° C. for one hour. A (second) initiator solutionof 0.01 grams of AIBN and 1.3 grams of ethyl acetate were then added.The mixture was held at about 77° C. for an additional two hours andthen cooled to yield a solution of the polymer of Formula 1 exhibitingthe following properties: solid content: 48.38%; monomer conversion:96.76%; solution viscosity (#4 spindle at 10 RPM): 12,300 cps.

EXAMPLE 2

Example 1 was repeated, except that in the final mixing step, 0.02 gramsof p-toluene sulfonic acid was included in the second initiator solutionto yield the polymer of Formula 2, solid content: 48.67%; monomerconversation: 97.34%; solution viscosity: 10,500 cps.

EXAMPLES 3-5

In a manner similar to Example 2, the polymers of Formulae 3-5 wereprepared by varying the amounts of the monomers accordingly.

Aluminum foil tapes were prepared from each of the adhesives of Formulae1-5 by casting the adhesive onto the foil backing material at athickness of about 1.5 mils.

Each of the resulting foil tapes was submitted to the aforementionedUL181A tests 1-5, as previously described in detail.

The results of these tests are set forth in Table 2.

                  TABLE 2                                                         ______________________________________                                                              TEST 3   TEST 4 TEST 5*                                        TEST  TEST 2   Shear    Shear  Shear                                          1     Shear    (short   (long  (high                                          Peel  (40° F.)                                                                        term)    term)  temp.)                                  ______________________________________                                        UL181    >60     >6 hrs.  >6 hrs.                                                                              >120   >6 hrs.                               Requirements                                                                           oz.                     hrs.                                         Test                                                                          Compounds                                                                     1        78      --       --     --     0.1                                                                           (fail)                                2        80      >100     >100   >300   10.0                                                                          (AVG)                                 3        84      >100     >100   >300   16.7                                                                          (AVG)                                 4        79      >100     >100   >300   43.0                                                                          (AVG)                                 5        84      >100     >100   >300   50.0                                                                          (AVG)                                 ______________________________________                                         *Since Test 5 is the most difficult to pass and hence the most critical,      this test was repeated a number of times for each sample. While the           samples all passed the test in every instance, there was some variance in     the numbers and accordingly the average time is given for each sample.   

In addition to the above polymer preparations and testings, it will benoted that a polymer was also prepared (in the manner described inExample 2) having the proportions: 77EHA/1MAG/11AA/11VA. Upon testings,it was found that this polymer having 1 part MAGME was marginal. It didnot always pass the high temperature shear test. Since the result wasnot always predictable, it was concluded that the lower range for theMAGME monomer should be about 1.5.

It will be noted that in Table 2, the "greater than" (>) sign means thatthe test was stopped after the indicated passage of time. Itaccordingly, does not imply that failure resulting at this time and theactual time lapses before failure are simply not known.

By way of recapitulation, the adhesives prepared in accordance of thisinvention are not alleged to be superior in performance to thoseprepared in accordance with the aforementioned copending applications.However, while the invention of Ser. No. 019,832 utilizes materials (themacromer) not presently available to the Applicant or his assignee, theinvention of Ser. No. 030,765 utilizes significantly greater amounts ofthe relatively expensive MAGME monomer. Accordingly, the main advantageof the present invention can be said to be the utilization of thecommercially available MAGME at a cost reduction of approximately 30%over the cost of preparing adhesives in Ser. No. 019,832. From thestandpoint of commercial sale, the significance of this 30% costreduction will be evident.

Since certain changes may be made without departing from the scope ofthe invention herein described, it is intended that all matter containedin the foregoing description, including the examples, shall be taken asillustrative and not in a limiting sense.

What is claimed is:
 1. An adhesive tape comprising a backing sheetmaterial carrying a layer of adhesive adapted for meeting UnderwritersLaboratories specifications for metal foil adhesive tapes for use withrigid fiberglass air ducts, said adhesive comprising an internallycrosslinked copolymer of:(1) from about 1.5 to about 2.5 parts by weightof an activated ester-containing vinyl monomer of the formula: ##STR5##wherein R is hydrogen or methyl; and R' is alkyl having one to sixcarbon atoms, or 2-hydroxyalkyl having two to six carbon atoms; (2) fromabout 11 to about 14 parts by weight of at least one ethylenicallyunsaturated carboxylic acid containing 3-5 carbon atoms; (3) from about70 to about 80 parts by weight of at least one acrylic or methacrylicacid ester of a non-tertiary alcohol having 10-14 carbon atom; and, (4)from about 6 to about 15 parts by weight of at least one vinyl ester ofa saturated carboxylic acid.
 2. An adhesive tape comprising a backingsheet material carrying a layer of an adhesive, said adhesive comprisingan internally crosslinked copolymer of:(1) from about 1.5 to about 2.5parts by weight of an activated ester-containing vinyl monomer of theformula: ##STR6## wherein R is hydrogen or methyl; and R' is alkylhaving one to six carbon atoms or 2-hydroxyalkyl having two to sixcarbon atoms; (2) from about 11 to about 14 parts weight of at least oneethylenically unsaturated carboxylic acid selected from the groupconsisting of acrylic acid, methacrylic acid, itaconic acid, maleic acidand fumaric acid; (3) from about 70 to about 80 parts by weight of atleast one acrylic or methacrylic acid ester of a non-tertiary alcoholhaving 1 to 14 carbon atoms selected from the group consisting of1-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol,2-ethyl-1-hexanol, 1-methyl-1-butanol, 1-methyl-1-pentanol,2-methyl-1-pentanol, 3-methyl-1-pentanol, 2-ethyl-1-butanol,3,5,5-trimethyl-1-hexanol, 3-heptanol, 2-octanol, 1-deconal, and1-dodecanol; and, (4) from about 6 to 15 parts by weight of at least onevinyl ester of saturated carboxylic acid selected from the groupconsisting of vinyl acetate, vinyl propionate, vinyl butyrate, and vinylvalerate.
 3. A metal foil tape meeting Underwriters Laboratoriescriteria for use with rigid fiberglass air ducts, said tape comprising ametal foil backing sheet carrying a layer of an adhesive compositioncomprising an internally crosslinked copolymer of:(1) from about 1.5 toabout 2.5 parts by weight of an activated ester-containing vinyl monomerof the formula: ##STR7## wherein R is hydrogen or methyl; and R' isalkyl having one to six carbon atoms, or 2-hydroxyalkyl having two tosix carbon atoms; (2) from about 11 to about 14 parts by weight of atleast one ethylenically unsaturated carboxylic acid containing 3-5carbon atoms; (3) from about 70 to about 80 parts by weight of at leastone acrylic or methacrylic acid ester of a non-tertiary alcohol having1-14 carbon atoms; and (4) from about 6 to about 15 parts by weight ofat least one vinyl ester of a saturated carboxylic acid.
 4. A metal foiltape as defined in claim 3 wherein said vinyl monomer is methylacrylamidoglycolate ethyl ether.
 5. A metal foil tape as defined inclaim 3 wherein said ethylenically unsaturated carboxylic acid isselected from the group consisting of acrylic acid, methacrylic acid,itaconic acid, maleic acid and fumaric acid.
 6. A metal foil tape asdefined in claim 3 wherein said non-tertiary alcohol is selected fromthe group consisting of 1-butanol, 1-pentanol, 2-pentanol, 3-pentanol,2-methyl-1-butanol, 1-methyl-1-butanol, 1-methyl-1-pentanol,2-methyl-1-pentanol, 3-methyl-1-pentanol, 2-ethyl-1-butanol,2-ethyl-1-hexanol, 3,5,5-trimethyl-1-hexanol,3-heptano1,2-octanol,1-decanol and 1-dodecanol.
 7. A metal foil tape asdefined in claim 3 wherein said vinyl ester is selected from the groupconsisting of vinyl acetate, vinyl propionate, vinyl butyrate and vinylvalerate.
 8. A metal foil tape meeting Underwriter Laboratories criteriafor use with rigid fiberglass air ducts, said tape comprising a metalfoil backing sheet carrying a layer of an adhesive compositioncomprising an internally crosslinked copolymer of:(1) from about 1.5 toabout 2.5 parts by weight of an activated ester-containing vinyl monomerof the formula: ##STR8## wherein R is hydrogen or methyl; and R' isalkyl having one to six carbon atoms, or 2-hydroxyalkyl having two tosix carbon atoms; (2) from about 11 to about 14 parts by weight of atleast one ethylenically unsaturated carboxylic acid selected from thegroup consisting of acrylic acid, methacrylic acid, itaconic acid,maleic acid and fumaric acid; (3) from about 70 to about 80 parts byweight of at least one acrylic or methacrylic acid ester of anon-tertiary alcohol having 1 to 14 carbon atoms selected from the groupconsisting of 1-butanol, 1-pentanol, 2-pentanol, 3-pentanol,2-methyl-1-butanol, 2-ethyl-1-hexanol, 1-methyl-1-butanol,1-methyl-1-pentanol, 2-methyl-1-pentanol, 3-methyl-1-pentanol,w-ethyl-1-butanol, 3,5,5-trimethyl-1-hexanol,3-heptanol2-octanol,1-decanol and 1-dodecanol; and, (4) from about 6 toabout 15 parts by weight of at least one vinyl ester of a saturatedcarboxylic acid selected from the group consisting of vinyl acetate,vinyl propionate, vinyl butyrate and vinyl valerate.
 9. A metal foiltape as defined in claim 8 wherein said vinyl monomer is methylacrylamidoglycolate ethyl ether.
 10. A metal foil tape as defined inclaim 9 wherein said carboxylic acid is acrylic acid.
 11. A metal foiltape as defined in claim 10 wherein said acrylic acid or methacrylicacid ester is 2-ethylhexyl acrylate.
 12. A metal foil tape as defined inclaim 11 wherein said vinyl ester is vinyl acetate.
 13. A method forforming an adhesion composition adapted for meeting UnderwriterLaboratories specifications for metal foil adhesion tapes for use withrigid fiberglass air ducts, comprising the steps of:(a) initiatingpolymerization of an organic solution of monomeric components consistingessentially of: (1) from about 1.5 to about 2.5 parts by weight of anactivated ester-containing vinyl monomer of the formula: ##STR9##wherein R is hydrogen or methyl; and R' is alkyl having one to sixcarbon atoms, or 2 hydroxyalkyl having two to six carbon atoms; (2) fromabout 11 to about 14 parts by weight of at least one ethylenicallyunsaturated carboxylic acid containing 3-5 carbon atoms; (3) from about70 to about 80 parts by weight of at least one acrylic or methacrylicacid ester of a non-tertiary alcohol having 10-14 carbon atoms; and, (4)from about 6 to about 15 parts by weight of at least one vinyl ester ofa saturated carboxylic acid; and,(b) before polymerization is complete,adding an acid catalyst to said solution; and (c) thereafter completingsaid polymerization to form said adhesion composition, (d) coating saidcomposition onto a metal foil backing sheet.